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김현섭,김병옥,한경윤,Kim, Hyun-Sub,Kim, Byung-Ok,Han, Kyung-Yoon 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1
The purpose of the this study was to research the interrelationship of periodontal status and patient's age between diabetic group and non-diabetic group and compare that of periodontal status according to the blood sugar level and duration of diabetics. The participants of this study were 52 diabetic patients and 51 non-diabetic patients. The diabetic group and non-diabetic group were further divided into four subgroups according to the age(under 35 years old, 36 - 45 years old, 46 - 55 years old, over 56 years old) and the diabetic group was further divided into three subgroups according to the duration of diabetics (under 5 years, 6 - 10 years, over 11 years) and blood sugar level(under 140mg/100ml, 140-200mg/100ml, over 200mg /100ml), respectively. Author evaluated such periodontal status as plaque index and calculus index, gingival lndex, loss of attachment, papillary bleeding index, tooth mobility and missing teeth, and then data was statistically analyzed by SPSS/PC+ using ANOVA, respectively. The results were as follows: 1. The mean value of plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth of diabetic patients were significantly higher than that of non-diabetic patients, respectively(p <0.01, p<0.01, p<0.01, p<0.01, p<0.001, p<0.001), but there was no significant difference between diabetic group and non-diabetic group in calculus index(P>0.05). 2. According to the increase of age, loss of attachment and missing teeth were increased in both group, and correlation of each subgroup was statistically significant, respectively(p<0.05, p<0.001). 3. According to the elevation of blood sugar level of diabetics, plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth were increased in diabetic group, and correlation of each subgroup was statistically significant, respectively (p<0.05, p<0.05, p<0.05, p<0.05, p<0.001, p<0.001). 4. According to the duration of diabetics, plaque index, gingival index, loss of attachment, papillary bleeding index, tooth mobility and missing teeth were increased in diabetic group, and correlation of each subgroup was statistically significant, respectively(p<0.05, p<0.05, p<0.05, p<0.05, p<0.001, p<0.001).
NH<sub>3</sub> 연료 사용 후 배출되는 NOx 제거를 위한 NH<sub>3</sub>-SCR 촉매 기술
김현섭 ( Hyun Sub Kim ),김도희 ( Do Heui Kim ) 한국공업화학회 2024 공업화학전망 Vol.27 No.1
온실가스를 배출하여 이상기후 현상을 일으키는 화석 연료를 대체하기 위해 친환경적인 NH<sub>3</sub>를 활용하고자 하는 노력이 지속되고 있다. NH<sub>3</sub>를 연료로 활용하면 CO<sub>2</sub>를 배출하지 않지만, 연료 중에 포함된 N 성분이 공기 중의 O<sub>2</sub>와 반응하여 과량의 NOx가 발생하게 된다. 현재 상용화 되어있는 NOx를 제거하는 가장 효율적이고 경제적인 방법 중 하나는 NH3를 활용한 선택적 촉매 환원(NH<sub>3</sub>-SCR) 방법이다. 그러나 상용 V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub>는 발전소 기동 초기 및 저부하 운전에서 발생하는 NOx를 효과적으로 제거하지 못하며, 황과 수분에 의해 촉매 활성이 감소하게 된다. 따라서, 본 기고문에서는 NOx를 더욱 효과적으로 제거할 수 있는 촉매를 설계하기 위하여, 현재까지 연구된 바나디아 기반 촉매뿐만 아니라 다양한 금속 산화물 촉매, 제올라이트 촉매의 특징 및 촉매 활성 개선을 위한 연구를 소개하고자 한다.
고 영각의 델타익을 지나는 와유동에 관한 수치해석적 연구
김현섭(Hyun Sub Kim),김희동(Heuy Dong Kim),손명환(Myong Hwan Sohn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper dispicts the vortex flow characteristics of a delta wing using the computation analysis. This<br/> study is focused on investigating and visualizing the effects of the angle of attack, free steam velocity, the<br/> development and interaction of vortices and the relationship between the suction pressure distribution and the<br/> vortex flow characteristics. Computations are applied to the three dimensional, compressible, Navier-Stokes<br/> Equations. For computations, the free stream velocity is changed between 20m/s and 60m/s and the angle of<br/> attack of the delta wing is changed between 16° and 24°. Computational results are compared with the<br/> previous experimental ones. It is found that the present CFD results predict the vortical flow characteristics of<br/> the delta wing well, and with an increase in the free stream velocity, the leading edge vortex moves outboard<br/> and its strength is increased.
카메라 타입 이미지 센서 및 면광원 활용 통합 레인센서 개발
김현섭(Hyun sub, Kim),이복철(Bock Cheol, Lee),오영섭(Young Sub, Oh),이진희(Jin Hee, Lee),공낙경(Nak Kyoung, Kong),김진,Seok Won, Yoon,Chang Yeong, Na 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The trend in the automotive industry is to exchange most of existing mechanical parts for electric or electronic parts in vehicle. The number of sensors are increased and the needs of customer are getting more complex. So most of hard parts to support driving condition should be changed to intelligent parts, like ASIC, MCU etc, to satisfy customer’s complex needs. We have two special concepts in this project to accomplish those goals. The first one is achieve the ability to develop rain sensor, the second one is to optimize and integrate several function, hardware parts to reduce the cost and package size.